Intertwined space-time symmetry, orbital magnetism, and dynamical Berry connection in a circularly shaken optical lattice

Chen, Hua1; Liu, W. Vincent2,3,4,5

2021-07-09

10.1103/PhysRevA.104.013308

PHYSICAL REVIEW A   影响因子和分区

2469-9926

2469-9934

We study the circular shaking of a two-dimensional optical lattice, which is essentially a (2 + 1)-dimensional space-time lattice exhibiting periodicities in both spatial and temporal dimensions. The near-resonant optical shaking considered here dynamically couples the low-lying s band and the first excited p bands by transferring a photon of shaking frequency. The intertwined space-time symmetries are further uncovered to elucidate the degeneracy in the spectrum solved with the generalized Bloch-Floquet theorem. Setting the chirality of circular shaking explicitly breaks time-reversal symmetry and lifts the degeneracy of p +/- = p(x) +/- ip(y) orbitals, leading to the local circulation of orbital magnetism, i.e., the imbalanced occupation in p +/- orbitals. Moreover, the dynamics of Berry connection is revealed by the time evolution of the Berry curvature and the polarization, which have physical observable effects in experiments. Interestingly, the dynamics is found characterized by a universal phase shift, governed by the time screw rotational symmetry involving a fractional translation of time. These findings suggest that the present lattice-shaking scheme provides a versatile platform for the investigation of the orbital physics and the symmetry-protected dynamics.

SCI ; EI

英语

其他

National Natural Science Foundation of China[11704338,11835011] ; AFOSR[FA9550-16-1-0006] ; MURI-ARO through UC Santa Barbara[W911NF-17-1-0323] ; Shanghai Municipal Science and Technology Major Project[2019SHZDZX01]

Optics ; Physics

Optics ; Physics, Atomic, Molecular & Chemical

WOS:000671584200004

AMER PHYSICAL SOC

20212910647168

Crystal lattices ; Dynamics ; Fruits ; Optical materials

Optical Devices and Systems:741.3 ; Laser Beam Interactions:744.8 ; Agricultural Products:821.4 ; Crystal Lattice:933.1.1

PHYSICS

Web of Science

1.Zhejiang Normal Univ, Dept Phys, Jinhua 321004, Zhejiang, Peoples R China
2.Univ Pittsburgh, Dept Phys & Astron, Pittsburgh, PA 15260 USA
3.Shanghai Jiao Tong Univ, Sch Phys & Astron, Wilczek Quantum Ctr, Shanghai 200240, Peoples R China
4.Southern Univ Sci & Technol, Shenzhen Inst Quantum Sci & Engn, Shenzhen 518055, Peoples R China
5.Southern Univ Sci & Technol, Dept Phys, Shenzhen 518055, Peoples R China

Chen, Hua,Liu, W. Vincent. Intertwined space-time symmetry, orbital magnetism, and dynamical Berry connection in a circularly shaken optical lattice[J]. PHYSICAL REVIEW A,2021,104(1).

Chen, Hua,&Liu, W. Vincent.(2021).Intertwined space-time symmetry, orbital magnetism, and dynamical Berry connection in a circularly shaken optical lattice.PHYSICAL REVIEW A,104(1).

Chen, Hua,et al."Intertwined space-time symmetry, orbital magnetism, and dynamical Berry connection in a circularly shaken optical lattice".PHYSICAL REVIEW A 104.1(2021).